Year	current US$
2000	370.73709106
2001	332.20077515
2002	311.0274353
2003	306.87591553
2004	381.62234497
2005	509.71066284
2006	532.66162109
2007	445.58428955
2008	429.44372559
2009	406.94772339
2010	417.30136108
2011	424.91506958
2012	452.06713867
2013	485.22167969
2014	476.77374268
2015	571.25274658
2016	654.56994629
2017	646.29205322
2018	736.77416992
2019	782.23565674
2020	707.47979736
2021	766.9440918